The movements of chemical weapons by Syria's elite Unit 450 could complicate any U.S. bombing campaign in Syria over its alleged chemical attacks, officials said. It also raises questions about implementation of a Russian proposal that calls for the regime to surrender control of its stockpile, they said.

U.S. and Israeli intelligence agencies still believe they know where most of the Syrian regime's chemical weapons are located, but with less confidence than six months ago, U.S. officials said. {...}

The unit is in charge of mixing and deploying chemical munitions, and it provides security at chemical sites, according to U.S. and European intelligence agencies. It is composed of officers from Mr. Assad's Alawite sect. One diplomat briefed on the unit said it was Alawite from "janitor to commander."

U.S. military officials have looked into the possibility of gaining influence over members of Unit 450 through inducements or threats. "In a perfect world, you would actually like to co-opt that unit. Who cares who pays them as long as they sit on the chemical weapons," said a senior U.S. military official.

Although the option remains on the table, government experts say the unit is so close knit that they doubt any member could break ranks without being exposed and killed.

The U.S. estimates the regime has 1,000 metric tons of chemical and biological agents. "That is what we know about. There might be more," said one senior U.S. official.

The U.S. now believes Mr. Assad's chemical arsenal has been scattered to as many as 50 locations in the west, north and south, as well as new sites in the east, officials said.

The U.S. is using satellites to track vehicles employed by Unit 450 to disperse the chemical-weapons stocks. But the imagery doesn't always show what is being put on the trucks. "We know a lot less than we did six months ago about where the chemical weapons are," one official said.

The movements, activities and base locations of Unit 450 are so sensitive that the U.S. won't share information with even trusted allies in the opposition for fear the unit would be overrun by rebels, said current and former U.S. officials. ('trusted allies in the opposition?' Please, my sides! On second thought Obama and Kerry probably are stupid enough to tell jihadis where they might be able to get their hands on chemical weapons)

If the Russians clinch a deal for Mr. Assad to give up his chemical weapons, any prospective United Nations-led force to protect inspectors and secure storage sites would likely need to work closely with Unit 450 and the research center, current and former administration officials said.

And Unit 450 will absolutely tell the UN inspectors where everything is - pinky promise, cross-my-heart-and-hope-to-meet-Allah.

“When we see that the U.S. genuinely stands for stability in our region, stops threatening us with military intervention and stops supplying terrorists with weapons, then we will consider it possible to finalize all necessary procedures and they will become legitimate and acceptable for Syria."